What does "contraindication" mean?

A factor or symptom which makes a certain treatment inadvisable, generally or individually.

What is a synonym for "contraindication"?

Common synonyms include: antagonism, antipathy, antithesis, clashing, collision, conflict.

Pronounced //ˌkɒntɹə.ɪndɪˈkeɪʃən//.

/ˌkɒntɹə.ɪndɪˈkeɪʃən/ noun

noun ·Rare ·Advanced level

Noun

1
A factor or symptom which makes a certain treatment inadvisable, generally or individually.
2
(medicine) a reason that makes it inadvisable to prescribe a particular drug or employ a particular procedure or treatment wordnet

From contra- + indication.